Essay --

Cloud Computing Cloud computing is a type of computing that depends on sharing computing resources rather than having local servers or personal device to handle applications. In cloud computing, the word cloud is used as a metaphor for â€Å"the internet†. So the cloud computing means â€Å"a type of internet-based computing†, where different services such as servers, storage and applications are delivered to an organization’s computers and devices through the internet. It allows consumers and businesses to use applications without installation and access their personal files at any computer with internet access. E.g. Yahoo mail, Gmail, Hotmail. Cloud computing is provides on-demand self-service. Service Models:- A cloud service is any resource that is provided over the internet. Service delivery in cloud computing comprises three different service models. †¢ Software-as-a-service (Saas):- Saas is the model in which an application is hosted as a service to customers who access it via the internet. E.g. Google docs, salesforce.com, CRM, ERP, email, social networking. It provides significant efficiencies in cost and delivery in exchange for minimal customization and represents a shift of operational risks from the consumer to the provider. User of Saas offering usually has neither knowledge nor control about the underlying infrastructure. †¢ Platform-as-a-service(Paas):- This kind of cloud computing provides development environment as a service. The consumer can use the middleman’s equipment to develop his own program and deliver it to the users through internet and servers. It provides a well organized and graceful approach to operate scale-out applications in a predictable and cost effective manner. The consumer controls the application that... ...tecture for scalability and availability as the public cloud but is restricted to a single organization. †¢ Community cloud:- A community cloud is controlled and used by a group of organizations that have shared interests, such as specific security requirements or a common mission. †¢ Hybrid cloud A hybrid cloud is a combination of a public and private cloud that interoperates. References:- http://cloudtweaks.com/2012/07/the-4-primary-cloud-deployment-models/ http://south.cattelecom.com/rtso/Technologies/CloudComputing/0071626948_chap01.pdf http://www.cloud-competence-center.com/understanding/cloud-computing-deployment-models/ http://www.wikinvest.com/concept/Cloud_Computing#References http://www.thbs.com/downloads/Cloud-Computing-Overview.pdf http://www.priv.gc.ca/resource/fs-fi/02_05_d_51_cc_e.pdf http://cloud.cio.gov/topics/cloud-computing-deployment-models